That really depends on your own personal goals and ambitions . No one knows that but yourself.
If your goal is to become a professional musician, you might want to practice for several hours a day. But if you just want to learn as a hobby, you might only need an hour or two a day.
I think a lot can be done in 30 minutes with focused practice . It's important to find a balance between challenging yourself and punishing yourself. Some guys say they practice 4 or 5 hours a day. That seems crazy as hell to me . But if you are enjoying the process. Good luck! Do what feels good to ya, But do it often and with a practice plan .